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3.2 Energetics

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Question 17
H

Hydrogen iodide decomposes into hydrogen and iodine.

2HI→H2+I2 \mathrm{2HI \rightarrow H_{2} + I_{2}} 2HI→H2​+I2​
BondH−I\mathrm{H{-}I}H−IH−H\mathrm{H{-}H}H−HI−I\mathrm{I{-}I}I−I
Bond energy (kJ/mol\mathrm{kJ/mol}kJ/mol)299436151

Which row shows the energy change and the type of reaction?

Energy change (kJ/mol\mathrm{kJ/mol}kJ/mol)Type of reaction
A-11exothermic
B+11endothermic
C-288exothermic
D+288endothermic
[1]
A

Row A

B

Row B

C

Row C

D

Row D

Markscheme

3.2 Energetics Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Energetics

51 exam-style questions on OCR GCSE Chemistry 3.2 Energetics, covering 3.2.1 Exothermic and endothermic reactions and reaction profiles and 3.2.2 Calculating energy change from bond energies. Each one has a worked solution and a mark scheme showing where the marks go.

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